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6-100V Wide Vin, Current Mode Synchronous Buck Controller

Availability: 18,473


Package | PIN: HTSSOP (PWP) | 20
Temp: S (-40 to 150)
Package qty | Carrier: 73 | TUBE
Qty Price
1-99 $4.70
100-249 $4.22
250-999 $3.01
1,000+ $2.56


  • Emulated Peak Current Mode
  • Wide Operating Range Up to 100 V
  • Low IQ Shutdown (< 10 µA)
  • Drives Standard or Logic Level MOSFETs
  • Robust 3.5-A Peak Gate Drive
  • Free-run or Synchronous Operation to 1 MHz
  • Optional Diode Emulation Mode
  • Programmable Output from 1.215 V to 80 V
  • Precision 1.5% Voltage Reference
  • Programmable Current Limit
  • Programmable Soft-Start
  • Programmable Line Undervoltage Lockout
  • Automatic Switch to External Bias Supply
  • HTSSOP-20 Exposed Pad
  • Thermal Shutdown
  • Create a Custom Design Using the LM5116 with the WEBENCH Power Designer

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Texas Instruments  LM5116MH/NOPB

The LM5116 is a synchronous buck controller intended for step-down regulator applicationsfrom a high-voltage or widely varying input supply. The control method is based upon current modecontrol utilizing an emulated current ramp. Current mode control provides inherent linefeed-forward, cycle-by-cycle current limiting, and ease-of-loop compensation. The use of anemulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowingreliable control of very small duty cycles necessary in high-input voltage applications.

The operating frequency is programmable from 50 kHz to 1 MHz. The LM5116 drives externalhigh-side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diodeemulation mode enables discontinuous mode operation, for improved efficiency at light loadconditions. A low quiescent current shutdown disables the controller and consumes less than 10 µAof total input current.

Additional features include a high-voltage bias regulator, automatic switch-over toexternal bias for improved efficiency, thermal shutdown, frequency synchronization, cycle-by-cyclecurrent limit, and adjustable line undervoltage lockout. The device is available in a powerenhanced HTSSOP-20 package featuring an exposed die attach pad to aid thermal dissipation.